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tsnep: Add TSN endpoint Ethernet MAC driver

Browse source 
The TSN endpoint Ethernet MAC is a FPGA based network device for
real-time communication.

It is integrated as Ethernet controller with ethtool and PTP support.
For real-time communcation TC_SETUP_QDISC_TAPRIO is supported.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerhard Engleder 2021-11-19 23:58:26 +01:00 committed by David S. Miller
parent 603094b2cd
commit 403f69bbdb
11 changed files with 3511 additions and 0 deletions
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1
drivers/net/ethernet/Kconfig
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@ -73,6 +73,7 @@ config DNET
source "drivers/net/ethernet/dec/Kconfig" source "drivers/net/ethernet/dec/Kconfig"
source "drivers/net/ethernet/dlink/Kconfig" source "drivers/net/ethernet/dlink/Kconfig"
source "drivers/net/ethernet/emulex/Kconfig" source "drivers/net/ethernet/emulex/Kconfig"
source "drivers/net/ethernet/engleder/Kconfig"
source "drivers/net/ethernet/ezchip/Kconfig" source "drivers/net/ethernet/ezchip/Kconfig"
source "drivers/net/ethernet/faraday/Kconfig" source "drivers/net/ethernet/faraday/Kconfig"
source "drivers/net/ethernet/freescale/Kconfig" source "drivers/net/ethernet/freescale/Kconfig"

1
drivers/net/ethernet/Makefile
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@ -36,6 +36,7 @@ obj-$(CONFIG_DNET) += dnet.o
obj-$(CONFIG_NET_VENDOR_DEC) += dec/ obj-$(CONFIG_NET_VENDOR_DEC) += dec/
obj-$(CONFIG_NET_VENDOR_DLINK) += dlink/ obj-$(CONFIG_NET_VENDOR_DLINK) += dlink/
obj-$(CONFIG_NET_VENDOR_EMULEX) += emulex/ obj-$(CONFIG_NET_VENDOR_EMULEX) += emulex/
obj-$(CONFIG_NET_VENDOR_ENGLEDER) += engleder/
obj-$(CONFIG_NET_VENDOR_EZCHIP) += ezchip/ obj-$(CONFIG_NET_VENDOR_EZCHIP) += ezchip/
obj-$(CONFIG_NET_VENDOR_FARADAY) += faraday/ obj-$(CONFIG_NET_VENDOR_FARADAY) += faraday/
obj-$(CONFIG_NET_VENDOR_FREESCALE) += freescale/ obj-$(CONFIG_NET_VENDOR_FREESCALE) += freescale/

38
drivers/net/ethernet/engleder/Kconfig Normal file
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@ -0,0 +1,38 @@
# SPDX-License-Identifier: GPL-2.0
#
# Engleder network device configuration
#
config NET_VENDOR_ENGLEDER
bool "Engleder devices"
default y
help
If you have a network (Ethernet) card belonging to this class, say Y.
Note that the answer to this question doesn't directly affect the
kernel: saying N will just cause the configurator to skip all
the questions about Engleder devices. If you say Y, you will be asked
for your specific card in the following questions.
if NET_VENDOR_ENGLEDER
config TSNEP
tristate "TSN endpoint support"
depends on PTP_1588_CLOCK_OPTIONAL
select PHYLIB
help
Support for the Engleder TSN endpoint Ethernet MAC IP Core.
To compile this driver as a module, choose M here. The module will be
called tsnep.
config TSNEP_SELFTESTS
bool "TSN endpoint self test support"
default n
depends on TSNEP
help
This enables self test support within the TSN endpoint driver.
If unsure, say N.
endif # NET_VENDOR_ENGLEDER

10
drivers/net/ethernet/engleder/Makefile Normal file
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@ -0,0 +1,10 @@
# SPDX-License-Identifier: GPL-2.0
#
# Makefile for the Engleder Ethernet drivers
#
obj-$(CONFIG_TSNEP) += tsnep.o
tsnep-objs := tsnep_main.o tsnep_ethtool.o tsnep_ptp.o tsnep_tc.o \
$(tsnep-y)
tsnep-$(CONFIG_TSNEP_SELFTESTS) += tsnep_selftests.o

190
drivers/net/ethernet/engleder/tsnep.h Normal file
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@ -0,0 +1,190 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
#ifndef _TSNEP_H
#define _TSNEP_H
#include "tsnep_hw.h"
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/etherdevice.h>
#include <linux/phy.h>
#include <linux/ethtool.h>
#include <linux/net_tstamp.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/miscdevice.h>
#define TSNEP "tsnep"
#define TSNEP_RING_SIZE 256
#define TSNEP_RING_ENTRIES_PER_PAGE (PAGE_SIZE / TSNEP_DESC_SIZE)
#define TSNEP_RING_PAGE_COUNT (TSNEP_RING_SIZE / TSNEP_RING_ENTRIES_PER_PAGE)
#define TSNEP_QUEUES 1
struct tsnep_gcl {
void __iomem *addr;
u64 base_time;
u64 cycle_time;
u64 cycle_time_extension;
struct tsnep_gcl_operation operation[TSNEP_GCL_COUNT];
int count;
u64 change_limit;
u64 start_time;
bool change;
};
struct tsnep_tx_entry {
struct tsnep_tx_desc *desc;
struct tsnep_tx_desc_wb *desc_wb;
dma_addr_t desc_dma;
bool owner_user_flag;
u32 properties;
struct sk_buff *skb;
size_t len;
DEFINE_DMA_UNMAP_ADDR(dma);
};
struct tsnep_tx {
struct tsnep_adapter *adapter;
void __iomem *addr;
void *page[TSNEP_RING_PAGE_COUNT];
dma_addr_t page_dma[TSNEP_RING_PAGE_COUNT];
/* TX ring lock */
spinlock_t lock;
struct tsnep_tx_entry entry[TSNEP_RING_SIZE];
int write;
int read;
u32 owner_counter;
int increment_owner_counter;
u32 packets;
u32 bytes;
u32 dropped;
};
struct tsnep_rx_entry {
struct tsnep_rx_desc *desc;
struct tsnep_rx_desc_wb *desc_wb;
dma_addr_t desc_dma;
u32 properties;
struct sk_buff *skb;
size_t len;
DEFINE_DMA_UNMAP_ADDR(dma);
};
struct tsnep_rx {
struct tsnep_adapter *adapter;
void __iomem *addr;
void *page[TSNEP_RING_PAGE_COUNT];
dma_addr_t page_dma[TSNEP_RING_PAGE_COUNT];
struct tsnep_rx_entry entry[TSNEP_RING_SIZE];
int read;
u32 owner_counter;
int increment_owner_counter;
u32 packets;
u32 bytes;
u32 dropped;
u32 multicast;
};
struct tsnep_queue {
struct tsnep_adapter *adapter;
struct tsnep_tx *tx;
struct tsnep_rx *rx;
struct napi_struct napi;
u32 irq_mask;
};
struct tsnep_adapter {
struct net_device *netdev;
u8 mac_address[ETH_ALEN];
struct mii_bus *mdiobus;
bool suppress_preamble;
phy_interface_t phy_mode;
struct phy_device *phydev;
int msg_enable;
struct platform_device *pdev;
struct device *dmadev;
void __iomem *addr;
unsigned long size;
int irq;
bool gate_control;
/* gate control lock */
struct mutex gate_control_lock;
bool gate_control_active;
struct tsnep_gcl gcl[2];
int next_gcl;
struct hwtstamp_config hwtstamp_config;
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_clock_info;
/* ptp clock lock */
spinlock_t ptp_lock;
int num_tx_queues;
struct tsnep_tx tx[TSNEP_MAX_QUEUES];
int num_rx_queues;
struct tsnep_rx rx[TSNEP_MAX_QUEUES];
int num_queues;
struct tsnep_queue queue[TSNEP_MAX_QUEUES];
};
extern const struct ethtool_ops tsnep_ethtool_ops;
int tsnep_ptp_init(struct tsnep_adapter *adapter);
void tsnep_ptp_cleanup(struct tsnep_adapter *adapter);
int tsnep_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
int tsnep_tc_init(struct tsnep_adapter *adapter);
void tsnep_tc_cleanup(struct tsnep_adapter *adapter);
int tsnep_tc_setup(struct net_device *netdev, enum tc_setup_type type,
void *type_data);
#if IS_ENABLED(CONFIG_TSNEP_SELFTESTS)
int tsnep_ethtool_get_test_count(void);
void tsnep_ethtool_get_test_strings(u8 *data);
void tsnep_ethtool_self_test(struct net_device *netdev,
struct ethtool_test *eth_test, u64 *data);
#else
static inline int tsnep_ethtool_get_test_count(void)
{
return -EOPNOTSUPP;
}
static inline void tsnep_ethtool_get_test_strings(u8 *data)
{
/* not enabled */
}
static inline void tsnep_ethtool_self_test(struct net_device *dev,
struct ethtool_test *eth_test,
u64 *data)
{
/* not enabled */
}
#endif /* CONFIG_TSNEP_SELFTESTS */
void tsnep_get_system_time(struct tsnep_adapter *adapter, u64 *time);
#endif /* _TSNEP_H */

293
drivers/net/ethernet/engleder/tsnep_ethtool.c Normal file
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@ -0,0 +1,293 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
#include "tsnep.h"
static const char tsnep_stats_strings[][ETH_GSTRING_LEN] = {
"rx_packets",
"rx_bytes",
"rx_dropped",
"rx_multicast",
"rx_phy_errors",
"rx_forwarded_phy_errors",
"rx_invalid_frame_errors",
"tx_packets",
"tx_bytes",
"tx_dropped",
};
struct tsnep_stats {
u64 rx_packets;
u64 rx_bytes;
u64 rx_dropped;
u64 rx_multicast;
u64 rx_phy_errors;
u64 rx_forwarded_phy_errors;
u64 rx_invalid_frame_errors;
u64 tx_packets;
u64 tx_bytes;
u64 tx_dropped;
};
#define TSNEP_STATS_COUNT (sizeof(struct tsnep_stats) / sizeof(u64))
static const char tsnep_rx_queue_stats_strings[][ETH_GSTRING_LEN] = {
"rx_%d_packets",
"rx_%d_bytes",
"rx_%d_dropped",
"rx_%d_multicast",
"rx_%d_no_descriptor_errors",
"rx_%d_buffer_too_small_errors",
"rx_%d_fifo_overflow_errors",
"rx_%d_invalid_frame_errors",
};
struct tsnep_rx_queue_stats {
u64 rx_packets;
u64 rx_bytes;
u64 rx_dropped;
u64 rx_multicast;
u64 rx_no_descriptor_errors;
u64 rx_buffer_too_small_errors;
u64 rx_fifo_overflow_errors;
u64 rx_invalid_frame_errors;
};
#define TSNEP_RX_QUEUE_STATS_COUNT (sizeof(struct tsnep_rx_queue_stats) / \
sizeof(u64))
static const char tsnep_tx_queue_stats_strings[][ETH_GSTRING_LEN] = {
"tx_%d_packets",
"tx_%d_bytes",
"tx_%d_dropped",
};
struct tsnep_tx_queue_stats {
u64 tx_packets;
u64 tx_bytes;
u64 tx_dropped;
};
#define TSNEP_TX_QUEUE_STATS_COUNT (sizeof(struct tsnep_tx_queue_stats) / \
sizeof(u64))
static void tsnep_ethtool_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *drvinfo)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
strscpy(drvinfo->driver, TSNEP, sizeof(drvinfo->driver));
strscpy(drvinfo->bus_info, dev_name(&adapter->pdev->dev),
sizeof(drvinfo->bus_info));
}
static int tsnep_ethtool_get_regs_len(struct net_device *netdev)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
int len;
int num_additional_queues;
len = TSNEP_MAC_SIZE;
/* first queue pair is within TSNEP_MAC_SIZE, only queues additional to
* the first queue pair extend the register length by TSNEP_QUEUE_SIZE
*/
num_additional_queues =
max(adapter->num_tx_queues, adapter->num_rx_queues) - 1;
len += TSNEP_QUEUE_SIZE * num_additional_queues;
return len;
}
static void tsnep_ethtool_get_regs(struct net_device *netdev,
struct ethtool_regs *regs,
void *p)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
regs->version = 1;
memcpy_fromio(p, adapter->addr, regs->len);
}
static u32 tsnep_ethtool_get_msglevel(struct net_device *netdev)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
return adapter->msg_enable;
}
static void tsnep_ethtool_set_msglevel(struct net_device *netdev, u32 data)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
adapter->msg_enable = data;
}
static void tsnep_ethtool_get_strings(struct net_device *netdev, u32 stringset,
u8 *data)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
int rx_count = adapter->num_rx_queues;
int tx_count = adapter->num_tx_queues;
int i, j;
switch (stringset) {
case ETH_SS_STATS:
memcpy(data, tsnep_stats_strings, sizeof(tsnep_stats_strings));
data += sizeof(tsnep_stats_strings);
for (i = 0; i < rx_count; i++) {
for (j = 0; j < TSNEP_RX_QUEUE_STATS_COUNT; j++) {
snprintf(data, ETH_GSTRING_LEN,
tsnep_rx_queue_stats_strings[j], i);
data += ETH_GSTRING_LEN;
}
}
for (i = 0; i < tx_count; i++) {
for (j = 0; j < TSNEP_TX_QUEUE_STATS_COUNT; j++) {
snprintf(data, ETH_GSTRING_LEN,
tsnep_tx_queue_stats_strings[j], i);
data += ETH_GSTRING_LEN;
}
}
break;
case ETH_SS_TEST:
tsnep_ethtool_get_test_strings(data);
break;
}
}
static void tsnep_ethtool_get_ethtool_stats(struct net_device *netdev,
struct ethtool_stats *stats,
u64 *data)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
int rx_count = adapter->num_rx_queues;
int tx_count = adapter->num_tx_queues;
struct tsnep_stats tsnep_stats;
struct tsnep_rx_queue_stats tsnep_rx_queue_stats;
struct tsnep_tx_queue_stats tsnep_tx_queue_stats;
u32 reg;
int i;
memset(&tsnep_stats, 0, sizeof(tsnep_stats));
for (i = 0; i < adapter->num_rx_queues; i++) {
tsnep_stats.rx_packets += adapter->rx[i].packets;
tsnep_stats.rx_bytes += adapter->rx[i].bytes;
tsnep_stats.rx_dropped += adapter->rx[i].dropped;
tsnep_stats.rx_multicast += adapter->rx[i].multicast;
}
reg = ioread32(adapter->addr + ECM_STAT);
tsnep_stats.rx_phy_errors =
(reg & ECM_STAT_RX_ERR_MASK) >> ECM_STAT_RX_ERR_SHIFT;
tsnep_stats.rx_forwarded_phy_errors =
(reg & ECM_STAT_FWD_RX_ERR_MASK) >> ECM_STAT_FWD_RX_ERR_SHIFT;
tsnep_stats.rx_invalid_frame_errors =
(reg & ECM_STAT_INV_FRM_MASK) >> ECM_STAT_INV_FRM_SHIFT;
for (i = 0; i < adapter->num_tx_queues; i++) {
tsnep_stats.tx_packets += adapter->tx[i].packets;
tsnep_stats.tx_bytes += adapter->tx[i].bytes;
tsnep_stats.tx_dropped += adapter->tx[i].dropped;
}
memcpy(data, &tsnep_stats, sizeof(tsnep_stats));
data += TSNEP_STATS_COUNT;
for (i = 0; i < rx_count; i++) {
memset(&tsnep_rx_queue_stats, 0, sizeof(tsnep_rx_queue_stats));
tsnep_rx_queue_stats.rx_packets = adapter->rx[i].packets;
tsnep_rx_queue_stats.rx_bytes = adapter->rx[i].bytes;
tsnep_rx_queue_stats.rx_dropped = adapter->rx[i].dropped;
tsnep_rx_queue_stats.rx_multicast = adapter->rx[i].multicast;
reg = ioread32(adapter->addr + TSNEP_QUEUE(i) +
TSNEP_RX_STATISTIC);
tsnep_rx_queue_stats.rx_no_descriptor_errors =
(reg & TSNEP_RX_STATISTIC_NO_DESC_MASK) >>
TSNEP_RX_STATISTIC_NO_DESC_SHIFT;
tsnep_rx_queue_stats.rx_buffer_too_small_errors =
(reg & TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK) >>
TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT;
tsnep_rx_queue_stats.rx_fifo_overflow_errors =
(reg & TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK) >>
TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT;
tsnep_rx_queue_stats.rx_invalid_frame_errors =
(reg & TSNEP_RX_STATISTIC_INVALID_FRAME_MASK) >>
TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT;
memcpy(data, &tsnep_rx_queue_stats,
sizeof(tsnep_rx_queue_stats));
data += TSNEP_RX_QUEUE_STATS_COUNT;
}
for (i = 0; i < tx_count; i++) {
memset(&tsnep_tx_queue_stats, 0, sizeof(tsnep_tx_queue_stats));
tsnep_tx_queue_stats.tx_packets += adapter->tx[i].packets;
tsnep_tx_queue_stats.tx_bytes += adapter->tx[i].bytes;
tsnep_tx_queue_stats.tx_dropped += adapter->tx[i].dropped;
memcpy(data, &tsnep_tx_queue_stats,
sizeof(tsnep_tx_queue_stats));
data += TSNEP_TX_QUEUE_STATS_COUNT;
}
}
static int tsnep_ethtool_get_sset_count(struct net_device *netdev, int sset)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
int rx_count;
int tx_count;
switch (sset) {
case ETH_SS_STATS:
rx_count = adapter->num_rx_queues;
tx_count = adapter->num_tx_queues;
return TSNEP_STATS_COUNT +
TSNEP_RX_QUEUE_STATS_COUNT * rx_count +
TSNEP_TX_QUEUE_STATS_COUNT * tx_count;
case ETH_SS_TEST:
return tsnep_ethtool_get_test_count();
default:
return -EOPNOTSUPP;
}
}
static int tsnep_ethtool_get_ts_info(struct net_device *dev,
struct ethtool_ts_info *info)
{
struct tsnep_adapter *adapter = netdev_priv(dev);
info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_TX_HARDWARE |
SOF_TIMESTAMPING_RX_HARDWARE |
SOF_TIMESTAMPING_RAW_HARDWARE;
if (adapter->ptp_clock)
info->phc_index = ptp_clock_index(adapter->ptp_clock);
else
info->phc_index = -1;
info->tx_types = BIT(HWTSTAMP_TX_OFF) |
BIT(HWTSTAMP_TX_ON);
info->rx_filters = BIT(HWTSTAMP_FILTER_NONE) |
BIT(HWTSTAMP_FILTER_ALL);
return 0;
}
const struct ethtool_ops tsnep_ethtool_ops = {
.get_drvinfo = tsnep_ethtool_get_drvinfo,
.get_regs_len = tsnep_ethtool_get_regs_len,
.get_regs = tsnep_ethtool_get_regs,
.get_msglevel = tsnep_ethtool_get_msglevel,
.set_msglevel = tsnep_ethtool_set_msglevel,
.nway_reset = phy_ethtool_nway_reset,
.get_link = ethtool_op_get_link,
.self_test = tsnep_ethtool_self_test,
.get_strings = tsnep_ethtool_get_strings,
.get_ethtool_stats = tsnep_ethtool_get_ethtool_stats,
.get_sset_count = tsnep_ethtool_get_sset_count,
.get_ts_info = tsnep_ethtool_get_ts_info,
.get_link_ksettings = phy_ethtool_get_link_ksettings,
.set_link_ksettings = phy_ethtool_set_link_ksettings,
};

230
drivers/net/ethernet/engleder/tsnep_hw.h Normal file
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@ -0,0 +1,230 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
/* Hardware definition of TSNEP and EtherCAT MAC device */
#ifndef _TSNEP_HW_H
#define _TSNEP_HW_H
#include <linux/types.h>
/* type */
#define ECM_TYPE 0x0000
#define ECM_REVISION_MASK 0x000000FF
#define ECM_REVISION_SHIFT 0
#define ECM_VERSION_MASK 0x0000FF00
#define ECM_VERSION_SHIFT 8
#define ECM_QUEUE_COUNT_MASK 0x00070000
#define ECM_QUEUE_COUNT_SHIFT 16
#define ECM_GATE_CONTROL 0x02000000
/* system time */
#define ECM_SYSTEM_TIME_LOW 0x0008
#define ECM_SYSTEM_TIME_HIGH 0x000C
/* clock */
#define ECM_CLOCK_RATE 0x0010
#define ECM_CLOCK_RATE_OFFSET_MASK 0x7FFFFFFF
#define ECM_CLOCK_RATE_OFFSET_SIGN 0x80000000
/* interrupt */
#define ECM_INT_ENABLE 0x0018
#define ECM_INT_ACTIVE 0x001C
#define ECM_INT_ACKNOWLEDGE 0x001C
#define ECM_INT_LINK 0x00000020
#define ECM_INT_TX_0 0x00000100
#define ECM_INT_RX_0 0x00000200
#define ECM_INT_ALL 0x7FFFFFFF
#define ECM_INT_DISABLE 0x80000000
/* reset */
#define ECM_RESET 0x0020
#define ECM_RESET_COMMON 0x00000001
#define ECM_RESET_CHANNEL 0x00000100
#define ECM_RESET_TXRX 0x00010000
/* control and status */
#define ECM_STATUS 0x0080
#define ECM_LINK_MODE_OFF 0x01000000
#define ECM_LINK_MODE_100 0x02000000
#define ECM_LINK_MODE_1000 0x04000000
#define ECM_NO_LINK 0x01000000
#define ECM_LINK_MODE_MASK 0x06000000
/* management data */
#define ECM_MD_CONTROL 0x0084
#define ECM_MD_STATUS 0x0084
#define ECM_MD_PREAMBLE 0x00000001
#define ECM_MD_READ 0x00000004
#define ECM_MD_WRITE 0x00000002
#define ECM_MD_ADDR_MASK 0x000000F8
#define ECM_MD_ADDR_SHIFT 3
#define ECM_MD_PHY_ADDR_MASK 0x00001F00
#define ECM_MD_PHY_ADDR_SHIFT 8
#define ECM_MD_BUSY 0x00000001
#define ECM_MD_DATA_MASK 0xFFFF0000
#define ECM_MD_DATA_SHIFT 16
/* statistic */
#define ECM_STAT 0x00B0
#define ECM_STAT_RX_ERR_MASK 0x000000FF
#define ECM_STAT_RX_ERR_SHIFT 0
#define ECM_STAT_INV_FRM_MASK 0x0000FF00
#define ECM_STAT_INV_FRM_SHIFT 8
#define ECM_STAT_FWD_RX_ERR_MASK 0x00FF0000
#define ECM_STAT_FWD_RX_ERR_SHIFT 16
/* tsnep */
#define TSNEP_MAC_SIZE 0x4000
#define TSNEP_QUEUE_SIZE 0x1000
#define TSNEP_QUEUE(n) ({ typeof(n) __n = (n); \
(__n) == 0 ? \
0 : \
TSNEP_MAC_SIZE + TSNEP_QUEUE_SIZE * ((__n) - 1); })
#define TSNEP_MAX_QUEUES 8
#define TSNEP_MAX_FRAME_SIZE (2 * 1024) /* hardware supports actually 16k */
#define TSNEP_DESC_SIZE 256
#define TSNEP_DESC_OFFSET 128
/* tsnep register */
#define TSNEP_INFO 0x0100
#define TSNEP_INFO_RX_ASSIGN 0x00010000
#define TSNEP_INFO_TX_TIME 0x00020000
#define TSNEP_CONTROL 0x0108
#define TSNEP_CONTROL_TX_RESET 0x00000001
#define TSNEP_CONTROL_TX_ENABLE 0x00000002
#define TSNEP_CONTROL_TX_DMA_ERROR 0x00000010
#define TSNEP_CONTROL_TX_DESC_ERROR 0x00000020
#define TSNEP_CONTROL_RX_RESET 0x00000100
#define TSNEP_CONTROL_RX_ENABLE 0x00000200
#define TSNEP_CONTROL_RX_DISABLE 0x00000400
#define TSNEP_CONTROL_RX_DMA_ERROR 0x00001000
#define TSNEP_CONTROL_RX_DESC_ERROR 0x00002000
#define TSNEP_TX_DESC_ADDR_LOW 0x0140
#define TSNEP_TX_DESC_ADDR_HIGH 0x0144
#define TSNEP_RX_DESC_ADDR_LOW 0x0180
#define TSNEP_RX_DESC_ADDR_HIGH 0x0184
#define TSNEP_RESET_OWNER_COUNTER 0x01
#define TSNEP_RX_STATISTIC 0x0190
#define TSNEP_RX_STATISTIC_NO_DESC_MASK 0x000000FF
#define TSNEP_RX_STATISTIC_NO_DESC_SHIFT 0
#define TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK 0x0000FF00
#define TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT 8
#define TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK 0x00FF0000
#define TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT 16
#define TSNEP_RX_STATISTIC_INVALID_FRAME_MASK 0xFF000000
#define TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT 24
#define TSNEP_RX_STATISTIC_NO_DESC 0x0190
#define TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL 0x0191
#define TSNEP_RX_STATISTIC_FIFO_OVERFLOW 0x0192
#define TSNEP_RX_STATISTIC_INVALID_FRAME 0x0193
#define TSNEP_RX_ASSIGN 0x01A0
#define TSNEP_RX_ASSIGN_ETHER_TYPE_ACTIVE 0x00000001
#define TSNEP_RX_ASSIGN_ETHER_TYPE_MASK 0xFFFF0000
#define TSNEP_RX_ASSIGN_ETHER_TYPE_SHIFT 16
#define TSNEP_MAC_ADDRESS_LOW 0x0800
#define TSNEP_MAC_ADDRESS_HIGH 0x0804
#define TSNEP_RX_FILTER 0x0806
#define TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS 0x0001
#define TSNEP_RX_FILTER_ACCEPT_ALL_UNICASTS 0x0002
#define TSNEP_GC 0x0808
#define TSNEP_GC_ENABLE_A 0x00000002
#define TSNEP_GC_ENABLE_B 0x00000004
#define TSNEP_GC_DISABLE 0x00000008
#define TSNEP_GC_ENABLE_TIMEOUT 0x00000010
#define TSNEP_GC_ACTIVE_A 0x00000002
#define TSNEP_GC_ACTIVE_B 0x00000004
#define TSNEP_GC_CHANGE_AB 0x00000008
#define TSNEP_GC_TIMEOUT_ACTIVE 0x00000010
#define TSNEP_GC_TIMEOUT_SIGNAL 0x00000020
#define TSNEP_GC_LIST_ERROR 0x00000080
#define TSNEP_GC_OPEN 0x00FF0000
#define TSNEP_GC_OPEN_SHIFT 16
#define TSNEP_GC_NEXT_OPEN 0xFF000000
#define TSNEP_GC_NEXT_OPEN_SHIFT 24
#define TSNEP_GC_TIMEOUT 131072
#define TSNEP_GC_TIME 0x080C
#define TSNEP_GC_CHANGE 0x0810
#define TSNEP_GCL_A 0x2000
#define TSNEP_GCL_B 0x2800
#define TSNEP_GCL_SIZE SZ_2K
/* tsnep gate control list operation */
struct tsnep_gcl_operation {
u32 properties;
u32 interval;
};
#define TSNEP_GCL_COUNT (TSNEP_GCL_SIZE / sizeof(struct tsnep_gcl_operation))
#define TSNEP_GCL_MASK 0x000000FF
#define TSNEP_GCL_INSERT 0x20000000
#define TSNEP_GCL_CHANGE 0x40000000
#define TSNEP_GCL_LAST 0x80000000
#define TSNEP_GCL_MIN_INTERVAL 32
/* tsnep TX/RX descriptor */
#define TSNEP_DESC_SIZE 256
#define TSNEP_DESC_SIZE_DATA_AFTER 2048
#define TSNEP_DESC_OFFSET 128
#define TSNEP_DESC_OWNER_COUNTER_MASK 0xC0000000
#define TSNEP_DESC_OWNER_COUNTER_SHIFT 30
#define TSNEP_DESC_LENGTH_MASK 0x00003FFF
#define TSNEP_DESC_INTERRUPT_FLAG 0x00040000
#define TSNEP_DESC_EXTENDED_WRITEBACK_FLAG 0x00080000
#define TSNEP_DESC_NO_LINK_FLAG 0x01000000
/* tsnep TX descriptor */
struct tsnep_tx_desc {
__le32 properties;
__le32 more_properties;
__le32 reserved[2];
__le64 next;
__le64 tx;
};
#define TSNEP_TX_DESC_OWNER_MASK 0xE0000000
#define TSNEP_TX_DESC_OWNER_USER_FLAG 0x20000000
#define TSNEP_TX_DESC_LAST_FRAGMENT_FLAG 0x00010000
#define TSNEP_TX_DESC_DATA_AFTER_DESC_FLAG 0x00020000
/* tsnep TX descriptor writeback */
struct tsnep_tx_desc_wb {
__le32 properties;
__le32 reserved1[3];
__le64 timestamp;
__le32 dma_delay;
__le32 reserved2;
};
#define TSNEP_TX_DESC_UNDERRUN_ERROR_FLAG 0x00010000
#define TSNEP_TX_DESC_DMA_DELAY_FIRST_DATA_MASK 0x0000FFFC
#define TSNEP_TX_DESC_DMA_DELAY_FIRST_DATA_SHIFT 2
#define TSNEP_TX_DESC_DMA_DELAY_LAST_DATA_MASK 0xFFFC0000
#define TSNEP_TX_DESC_DMA_DELAY_LAST_DATA_SHIFT 18
#define TSNEP_TX_DESC_DMA_DELAY_NS 64
/* tsnep RX descriptor */
struct tsnep_rx_desc {
__le32 properties;
__le32 reserved[3];
__le64 next;
__le64 rx;
};
#define TSNEP_RX_DESC_BUFFER_SIZE_MASK 0x00003FFC
/* tsnep RX descriptor writeback */
struct tsnep_rx_desc_wb {
__le32 properties;
__le32 reserved[7];
};
/* tsnep RX inline meta */
struct tsnep_rx_inline {
__le64 reserved;
__le64 timestamp;
};
#define TSNEP_RX_INLINE_METADATA_SIZE (sizeof(struct tsnep_rx_inline))
#endif /* _TSNEP_HW_H */

1273
drivers/net/ethernet/engleder/tsnep_main.c Normal file
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221
drivers/net/ethernet/engleder/tsnep_ptp.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
#include "tsnep.h"
void tsnep_get_system_time(struct tsnep_adapter *adapter, u64 *time)
{
u32 high_before;
u32 low;
u32 high;
/* read high dword twice to detect overrun */
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
do {
low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
high_before = high;
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
} while (high != high_before);
*time = (((u64)high) << 32) | ((u64)low);
}
int tsnep_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
struct hwtstamp_config config;
if (!ifr)
return -EINVAL;
if (cmd == SIOCSHWTSTAMP) {
if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
return -EFAULT;
if (config.flags)
return -EINVAL;
switch (config.tx_type) {
case HWTSTAMP_TX_OFF:
case HWTSTAMP_TX_ON:
break;
default:
return -ERANGE;
}
switch (config.rx_filter) {
case HWTSTAMP_FILTER_NONE:
break;
case HWTSTAMP_FILTER_ALL:
case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
case HWTSTAMP_FILTER_NTP_ALL:
config.rx_filter = HWTSTAMP_FILTER_ALL;
break;
default:
return -ERANGE;
}
memcpy(&adapter->hwtstamp_config, &config,
sizeof(adapter->hwtstamp_config));
}
if (copy_to_user(ifr->ifr_data, &adapter->hwtstamp_config,
sizeof(adapter->hwtstamp_config)))
return -EFAULT;
return 0;
}
static int tsnep_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
bool negative = false;
u64 rate_offset;
if (scaled_ppm < 0) {
scaled_ppm = -scaled_ppm;
negative = true;
}
/* convert from 16 bit to 32 bit binary fractional, divide by 1000000 to
* eliminate ppm, multiply with 8 to compensate 8ns clock cycle time,
* simplify calculation because 15625 * 8 = 1000000 / 8
*/
rate_offset = scaled_ppm;
rate_offset <<= 16 - 3;
rate_offset = div_u64(rate_offset, 15625);
rate_offset &= ECM_CLOCK_RATE_OFFSET_MASK;
if (negative)
rate_offset |= ECM_CLOCK_RATE_OFFSET_SIGN;
iowrite32(rate_offset & 0xFFFFFFFF, adapter->addr + ECM_CLOCK_RATE);
return 0;
}
static int tsnep_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
u64 system_time;
unsigned long flags;
spin_lock_irqsave(&adapter->ptp_lock, flags);
tsnep_get_system_time(adapter, &system_time);
system_time += delta;
/* high dword is buffered in hardware and synchronously written to
* system time when low dword is written
*/
iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
iowrite32(system_time & 0xFFFFFFFF,
adapter->addr + ECM_SYSTEM_TIME_LOW);
spin_unlock_irqrestore(&adapter->ptp_lock, flags);
return 0;
}
static int tsnep_ptp_gettimex64(struct ptp_clock_info *ptp,
struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
u32 high_before;
u32 low;
u32 high;
u64 system_time;
/* read high dword twice to detect overrun */
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
do {
ptp_read_system_prets(sts);
low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
ptp_read_system_postts(sts);
high_before = high;
high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
} while (high != high_before);
system_time = (((u64)high) << 32) | ((u64)low);
*ts = ns_to_timespec64(system_time);
return 0;
}
static int tsnep_ptp_settime64(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
struct tsnep_adapter *adapter = container_of(ptp, struct tsnep_adapter,
ptp_clock_info);
u64 system_time = timespec64_to_ns(ts);
unsigned long flags;
spin_lock_irqsave(&adapter->ptp_lock, flags);
/* high dword is buffered in hardware and synchronously written to
* system time when low dword is written
*/
iowrite32(system_time >> 32, adapter->addr + ECM_SYSTEM_TIME_HIGH);
iowrite32(system_time & 0xFFFFFFFF,
adapter->addr + ECM_SYSTEM_TIME_LOW);
spin_unlock_irqrestore(&adapter->ptp_lock, flags);
return 0;
}
int tsnep_ptp_init(struct tsnep_adapter *adapter)
{
int retval = 0;
adapter->hwtstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;
adapter->hwtstamp_config.tx_type = HWTSTAMP_TX_OFF;
snprintf(adapter->ptp_clock_info.name, 16, "%s", TSNEP);
adapter->ptp_clock_info.owner = THIS_MODULE;
/* at most 2^-1ns adjustment every clock cycle for 8ns clock cycle time,
* stay slightly below because only bits below 2^-1ns are supported
*/
adapter->ptp_clock_info.max_adj = (500000000 / 8 - 1);
adapter->ptp_clock_info.adjfine = tsnep_ptp_adjfine;
adapter->ptp_clock_info.adjtime = tsnep_ptp_adjtime;
adapter->ptp_clock_info.gettimex64 = tsnep_ptp_gettimex64;
adapter->ptp_clock_info.settime64 = tsnep_ptp_settime64;
spin_lock_init(&adapter->ptp_lock);
adapter->ptp_clock = ptp_clock_register(&adapter->ptp_clock_info,
&adapter->pdev->dev);
if (IS_ERR(adapter->ptp_clock)) {
netdev_err(adapter->netdev, "ptp_clock_register failed\n");
retval = PTR_ERR(adapter->ptp_clock);
adapter->ptp_clock = NULL;
} else if (adapter->ptp_clock) {
netdev_info(adapter->netdev, "PHC added\n");
}
return retval;
}
void tsnep_ptp_cleanup(struct tsnep_adapter *adapter)
{
if (adapter->ptp_clock) {
ptp_clock_unregister(adapter->ptp_clock);
netdev_info(adapter->netdev, "PHC removed\n");
}
}

811
drivers/net/ethernet/engleder/tsnep_selftests.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
#include "tsnep.h"
#include <net/pkt_sched.h>
enum tsnep_test {
TSNEP_TEST_ENABLE = 0,
TSNEP_TEST_TAPRIO,
TSNEP_TEST_TAPRIO_CHANGE,
TSNEP_TEST_TAPRIO_EXTENSION,
};
static const char tsnep_test_strings[][ETH_GSTRING_LEN] = {
"Enable timeout (offline)",
"TAPRIO (offline)",
"TAPRIO change (offline)",
"TAPRIO extension (offline)",
};
#define TSNEP_TEST_COUNT (sizeof(tsnep_test_strings) / ETH_GSTRING_LEN)
static bool enable_gc_timeout(struct tsnep_adapter *adapter)
{
iowrite8(TSNEP_GC_ENABLE_TIMEOUT, adapter->addr + TSNEP_GC);
if (!(ioread32(adapter->addr + TSNEP_GC) & TSNEP_GC_TIMEOUT_ACTIVE))
return false;
return true;
}
static bool gc_timeout_signaled(struct tsnep_adapter *adapter)
{
if (ioread32(adapter->addr + TSNEP_GC) & TSNEP_GC_TIMEOUT_SIGNAL)
return true;
return false;
}
static bool ack_gc_timeout(struct tsnep_adapter *adapter)
{
iowrite8(TSNEP_GC_ENABLE_TIMEOUT, adapter->addr + TSNEP_GC);
if (ioread32(adapter->addr + TSNEP_GC) &
(TSNEP_GC_TIMEOUT_ACTIVE | TSNEP_GC_TIMEOUT_SIGNAL))
return false;
return true;
}
static bool enable_gc(struct tsnep_adapter *adapter, bool a)
{
u8 enable;
u8 active;
if (a) {
enable = TSNEP_GC_ENABLE_A;
active = TSNEP_GC_ACTIVE_A;
} else {
enable = TSNEP_GC_ENABLE_B;
active = TSNEP_GC_ACTIVE_B;
}
iowrite8(enable, adapter->addr + TSNEP_GC);
if (!(ioread32(adapter->addr + TSNEP_GC) & active))
return false;
return true;
}
static bool disable_gc(struct tsnep_adapter *adapter)
{
iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
if (ioread32(adapter->addr + TSNEP_GC) &
(TSNEP_GC_ACTIVE_A | TSNEP_GC_ACTIVE_B))
return false;
return true;
}
static bool gc_delayed_enable(struct tsnep_adapter *adapter, bool a, int delay)
{
u64 before, after;
u32 time;
bool enabled;
if (!disable_gc(adapter))
return false;
before = ktime_get_ns();
if (!enable_gc_timeout(adapter))
return false;
/* for start time after timeout, the timeout can guarantee, that enable
* is blocked if too late
*/
time = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
time += TSNEP_GC_TIMEOUT;
iowrite32(time, adapter->addr + TSNEP_GC_TIME);
ndelay(delay);
enabled = enable_gc(adapter, a);
after = ktime_get_ns();
if (delay > TSNEP_GC_TIMEOUT) {
/* timeout must have blocked enable */
if (enabled)
return false;
} else if ((after - before) < TSNEP_GC_TIMEOUT * 14 / 16) {
/* timeout must not have blocked enable */
if (!enabled)
return false;
}
if (enabled) {
if (gc_timeout_signaled(adapter))
return false;
} else {
if (!gc_timeout_signaled(adapter))
return false;
if (!ack_gc_timeout(adapter))
return false;
}
if (!disable_gc(adapter))
return false;
return true;
}
static bool tsnep_test_gc_enable(struct tsnep_adapter *adapter)
{
int i;
iowrite32(0x80000001, adapter->addr + TSNEP_GCL_A + 0);
iowrite32(100000, adapter->addr + TSNEP_GCL_A + 4);
for (i = 0; i < 200000; i += 100) {
if (!gc_delayed_enable(adapter, true, i))
return false;
}
iowrite32(0x80000001, adapter->addr + TSNEP_GCL_B + 0);
iowrite32(100000, adapter->addr + TSNEP_GCL_B + 4);
for (i = 0; i < 200000; i += 100) {
if (!gc_delayed_enable(adapter, false, i))
return false;
}
return true;
}
static void delay_base_time(struct tsnep_adapter *adapter,
struct tc_taprio_qopt_offload *qopt, s64 ms)
{
u64 system_time;
u64 base_time = ktime_to_ns(qopt->base_time);
u64 n;
tsnep_get_system_time(adapter, &system_time);
system_time += ms * 1000000;
n = div64_u64(system_time - base_time, qopt->cycle_time);
qopt->base_time = ktime_add_ns(qopt->base_time,
(n + 1) * qopt->cycle_time);
}
static void get_gate_state(struct tsnep_adapter *adapter, u32 *gc, u32 *gc_time,
u64 *system_time)
{
u32 time_high_before;
u32 time_low;
u32 time_high;
u32 gc_time_before;
time_high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
*gc_time = ioread32(adapter->addr + TSNEP_GC_TIME);
do {
time_low = ioread32(adapter->addr + ECM_SYSTEM_TIME_LOW);
*gc = ioread32(adapter->addr + TSNEP_GC);
gc_time_before = *gc_time;
*gc_time = ioread32(adapter->addr + TSNEP_GC_TIME);
time_high_before = time_high;
time_high = ioread32(adapter->addr + ECM_SYSTEM_TIME_HIGH);
} while ((time_high != time_high_before) ||
(*gc_time != gc_time_before));
*system_time = (((u64)time_high) << 32) | ((u64)time_low);
}
static int get_operation(struct tsnep_gcl *gcl, u64 system_time, u64 *next)
{
u64 n = div64_u64(system_time - gcl->base_time, gcl->cycle_time);
u64 cycle_start = gcl->base_time + gcl->cycle_time * n;
int i;
*next = cycle_start;
for (i = 0; i < gcl->count; i++) {
*next += gcl->operation[i].interval;
if (*next > system_time)
break;
}
return i;
}
static bool check_gate(struct tsnep_adapter *adapter)
{
u32 gc_time;
u32 gc;
u64 system_time;
struct tsnep_gcl *curr;
struct tsnep_gcl *prev;
u64 next_time;
u8 gate_open;
u8 next_gate_open;
get_gate_state(adapter, &gc, &gc_time, &system_time);
if (gc & TSNEP_GC_ACTIVE_A) {
curr = &adapter->gcl[0];
prev = &adapter->gcl[1];
} else if (gc & TSNEP_GC_ACTIVE_B) {
curr = &adapter->gcl[1];
prev = &adapter->gcl[0];
} else {
return false;
}
if (curr->start_time <= system_time) {
/* GCL is already active */
int index;
index = get_operation(curr, system_time, &next_time);
gate_open = curr->operation[index].properties & TSNEP_GCL_MASK;
if (index == curr->count - 1)
index = 0;
else
index++;
next_gate_open =
curr->operation[index].properties & TSNEP_GCL_MASK;
} else if (curr->change) {
/* operation of previous GCL is active */
int index;
u64 start_before;
u64 n;
index = get_operation(prev, system_time, &next_time);
next_time = curr->start_time;
start_before = prev->base_time;
n = div64_u64(curr->start_time - start_before,
prev->cycle_time);
start_before += n * prev->cycle_time;
if (curr->start_time == start_before)
start_before -= prev->cycle_time;
if (((start_before + prev->cycle_time_extension) >=
curr->start_time) &&
(curr->start_time - prev->cycle_time_extension <=
system_time)) {
/* extend */
index = prev->count - 1;
}
gate_open = prev->operation[index].properties & TSNEP_GCL_MASK;
next_gate_open =
curr->operation[0].properties & TSNEP_GCL_MASK;
} else {
/* GCL is waiting for start */
next_time = curr->start_time;
gate_open = 0xFF;
next_gate_open = curr->operation[0].properties & TSNEP_GCL_MASK;
}
if (gc_time != (next_time & 0xFFFFFFFF)) {
dev_err(&adapter->pdev->dev, "gate control time 0x%x!=0x%llx\n",
gc_time, next_time);
return false;
}
if (((gc & TSNEP_GC_OPEN) >> TSNEP_GC_OPEN_SHIFT) != gate_open) {
dev_err(&adapter->pdev->dev,
"gate control open 0x%02x!=0x%02x\n",
((gc & TSNEP_GC_OPEN) >> TSNEP_GC_OPEN_SHIFT),
gate_open);
return false;
}
if (((gc & TSNEP_GC_NEXT_OPEN) >> TSNEP_GC_NEXT_OPEN_SHIFT) !=
next_gate_open) {
dev_err(&adapter->pdev->dev,
"gate control next open 0x%02x!=0x%02x\n",
((gc & TSNEP_GC_NEXT_OPEN) >> TSNEP_GC_NEXT_OPEN_SHIFT),
next_gate_open);
return false;
}
return true;
}
static bool check_gate_duration(struct tsnep_adapter *adapter, s64 ms)
{
ktime_t start = ktime_get();
do {
if (!check_gate(adapter))
return false;
} while (ktime_ms_delta(ktime_get(), start) < ms);
return true;
}
static bool enable_check_taprio(struct tsnep_adapter *adapter,
struct tc_taprio_qopt_offload *qopt, s64 ms)
{
int retval;
retval = tsnep_tc_setup(adapter->netdev, TC_SETUP_QDISC_TAPRIO, qopt);
if (retval)
return false;
if (!check_gate_duration(adapter, ms))
return false;
return true;
}
static bool disable_taprio(struct tsnep_adapter *adapter)
{
struct tc_taprio_qopt_offload qopt;
int retval;
memset(&qopt, 0, sizeof(qopt));
qopt.enable = 0;
retval = tsnep_tc_setup(adapter->netdev, TC_SETUP_QDISC_TAPRIO, &qopt);
if (retval)
return false;
return true;
}
static bool run_taprio(struct tsnep_adapter *adapter,
struct tc_taprio_qopt_offload *qopt, s64 ms)
{
if (!enable_check_taprio(adapter, qopt, ms))
return false;
if (!disable_taprio(adapter))
return false;
return true;
}
static bool tsnep_test_taprio(struct tsnep_adapter *adapter)
{
struct tc_taprio_qopt_offload *qopt;
int i;
qopt = kzalloc(struct_size(qopt, entries, 255), GFP_KERNEL);
if (!qopt)
return false;
for (i = 0; i < 255; i++)
qopt->entries[i].command = TC_TAPRIO_CMD_SET_GATES;
qopt->enable = 1;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 1500000;
qopt->cycle_time_extension = 0;
qopt->entries[0].gate_mask = 0x02;
qopt->entries[0].interval = 200000;
qopt->entries[1].gate_mask = 0x03;
qopt->entries[1].interval = 800000;
qopt->entries[2].gate_mask = 0x07;
qopt->entries[2].interval = 240000;
qopt->entries[3].gate_mask = 0x01;
qopt->entries[3].interval = 80000;
qopt->entries[4].gate_mask = 0x04;
qopt->entries[4].interval = 70000;
qopt->entries[5].gate_mask = 0x06;
qopt->entries[5].interval = 60000;
qopt->entries[6].gate_mask = 0x0F;
qopt->entries[6].interval = 50000;
qopt->num_entries = 7;
if (!run_taprio(adapter, qopt, 100))
goto failed;
qopt->enable = 1;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 411854;
qopt->cycle_time_extension = 0;
qopt->entries[0].gate_mask = 0x17;
qopt->entries[0].interval = 23842;
qopt->entries[1].gate_mask = 0x16;
qopt->entries[1].interval = 13482;
qopt->entries[2].gate_mask = 0x15;
qopt->entries[2].interval = 49428;
qopt->entries[3].gate_mask = 0x14;
qopt->entries[3].interval = 38189;
qopt->entries[4].gate_mask = 0x13;
qopt->entries[4].interval = 92321;
qopt->entries[5].gate_mask = 0x12;
qopt->entries[5].interval = 71239;
qopt->entries[6].gate_mask = 0x11;
qopt->entries[6].interval = 69932;
qopt->entries[7].gate_mask = 0x10;
qopt->entries[7].interval = 53421;
qopt->num_entries = 8;
if (!run_taprio(adapter, qopt, 100))
goto failed;
qopt->enable = 1;
qopt->base_time = ktime_set(0, 0);
delay_base_time(adapter, qopt, 12);
qopt->cycle_time = 125000;
qopt->cycle_time_extension = 0;
qopt->entries[0].gate_mask = 0x27;
qopt->entries[0].interval = 15000;
qopt->entries[1].gate_mask = 0x26;
qopt->entries[1].interval = 15000;
qopt->entries[2].gate_mask = 0x25;
qopt->entries[2].interval = 12500;
qopt->entries[3].gate_mask = 0x24;
qopt->entries[3].interval = 17500;
qopt->entries[4].gate_mask = 0x23;
qopt->entries[4].interval = 10000;
qopt->entries[5].gate_mask = 0x22;
qopt->entries[5].interval = 11000;
qopt->entries[6].gate_mask = 0x21;
qopt->entries[6].interval = 9000;
qopt->entries[7].gate_mask = 0x20;
qopt->entries[7].interval = 10000;
qopt->entries[8].gate_mask = 0x20;
qopt->entries[8].interval = 12500;
qopt->entries[9].gate_mask = 0x20;
qopt->entries[9].interval = 12500;
qopt->num_entries = 10;
if (!run_taprio(adapter, qopt, 100))
goto failed;
kfree(qopt);
return true;
failed:
disable_taprio(adapter);
kfree(qopt);
return false;
}
static bool tsnep_test_taprio_change(struct tsnep_adapter *adapter)
{
struct tc_taprio_qopt_offload *qopt;
int i;
qopt = kzalloc(struct_size(qopt, entries, 255), GFP_KERNEL);
if (!qopt)
return false;
for (i = 0; i < 255; i++)
qopt->entries[i].command = TC_TAPRIO_CMD_SET_GATES;
qopt->enable = 1;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 100000;
qopt->cycle_time_extension = 0;
qopt->entries[0].gate_mask = 0x30;
qopt->entries[0].interval = 20000;
qopt->entries[1].gate_mask = 0x31;
qopt->entries[1].interval = 80000;
qopt->num_entries = 2;
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to identical */
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
delay_base_time(adapter, qopt, 17);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to same cycle time */
qopt->base_time = ktime_set(0, 0);
qopt->entries[0].gate_mask = 0x42;
qopt->entries[1].gate_mask = 0x43;
delay_base_time(adapter, qopt, 2);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->entries[0].gate_mask = 0x54;
qopt->entries[0].interval = 33333;
qopt->entries[1].gate_mask = 0x55;
qopt->entries[1].interval = 66667;
delay_base_time(adapter, qopt, 23);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->entries[0].gate_mask = 0x66;
qopt->entries[0].interval = 50000;
qopt->entries[1].gate_mask = 0x67;
qopt->entries[1].interval = 25000;
qopt->entries[2].gate_mask = 0x68;
qopt->entries[2].interval = 25000;
qopt->num_entries = 3;
delay_base_time(adapter, qopt, 11);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to multiple of cycle time */
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 200000;
qopt->entries[0].gate_mask = 0x79;
qopt->entries[0].interval = 50000;
qopt->entries[1].gate_mask = 0x7A;
qopt->entries[1].interval = 150000;
qopt->num_entries = 2;
delay_base_time(adapter, qopt, 11);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 1000000;
qopt->entries[0].gate_mask = 0x7B;
qopt->entries[0].interval = 125000;
qopt->entries[1].gate_mask = 0x7C;
qopt->entries[1].interval = 250000;
qopt->entries[2].gate_mask = 0x7D;
qopt->entries[2].interval = 375000;
qopt->entries[3].gate_mask = 0x7E;
qopt->entries[3].interval = 250000;
qopt->num_entries = 4;
delay_base_time(adapter, qopt, 3);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to shorter cycle time */
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 333333;
qopt->entries[0].gate_mask = 0x8F;
qopt->entries[0].interval = 166666;
qopt->entries[1].gate_mask = 0x80;
qopt->entries[1].interval = 166667;
qopt->num_entries = 2;
delay_base_time(adapter, qopt, 11);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 62500;
qopt->entries[0].gate_mask = 0x81;
qopt->entries[0].interval = 31250;
qopt->entries[1].gate_mask = 0x82;
qopt->entries[1].interval = 15625;
qopt->entries[2].gate_mask = 0x83;
qopt->entries[2].interval = 15625;
qopt->num_entries = 3;
delay_base_time(adapter, qopt, 1);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to longer cycle time */
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 400000;
qopt->entries[0].gate_mask = 0x84;
qopt->entries[0].interval = 100000;
qopt->entries[1].gate_mask = 0x85;
qopt->entries[1].interval = 100000;
qopt->entries[2].gate_mask = 0x86;
qopt->entries[2].interval = 100000;
qopt->entries[3].gate_mask = 0x87;
qopt->entries[3].interval = 100000;
qopt->num_entries = 4;
delay_base_time(adapter, qopt, 7);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 1700000;
qopt->entries[0].gate_mask = 0x88;
qopt->entries[0].interval = 200000;
qopt->entries[1].gate_mask = 0x89;
qopt->entries[1].interval = 300000;
qopt->entries[2].gate_mask = 0x8A;
qopt->entries[2].interval = 600000;
qopt->entries[3].gate_mask = 0x8B;
qopt->entries[3].interval = 100000;
qopt->entries[4].gate_mask = 0x8C;
qopt->entries[4].interval = 500000;
qopt->num_entries = 5;
delay_base_time(adapter, qopt, 6);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
if (!disable_taprio(adapter))
goto failed;
kfree(qopt);
return true;
failed:
disable_taprio(adapter);
kfree(qopt);
return false;
}
static bool tsnep_test_taprio_extension(struct tsnep_adapter *adapter)
{
struct tc_taprio_qopt_offload *qopt;
int i;
qopt = kzalloc(struct_size(qopt, entries, 255), GFP_KERNEL);
if (!qopt)
return false;
for (i = 0; i < 255; i++)
qopt->entries[i].command = TC_TAPRIO_CMD_SET_GATES;
qopt->enable = 1;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 100000;
qopt->cycle_time_extension = 50000;
qopt->entries[0].gate_mask = 0x90;
qopt->entries[0].interval = 20000;
qopt->entries[1].gate_mask = 0x91;
qopt->entries[1].interval = 80000;
qopt->num_entries = 2;
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to different phase */
qopt->base_time = ktime_set(0, 50000);
qopt->entries[0].gate_mask = 0x92;
qopt->entries[0].interval = 33000;
qopt->entries[1].gate_mask = 0x93;
qopt->entries[1].interval = 67000;
qopt->num_entries = 2;
delay_base_time(adapter, qopt, 2);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to different phase and longer cycle time */
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 1000000;
qopt->cycle_time_extension = 700000;
qopt->entries[0].gate_mask = 0x94;
qopt->entries[0].interval = 400000;
qopt->entries[1].gate_mask = 0x95;
qopt->entries[1].interval = 600000;
qopt->num_entries = 2;
delay_base_time(adapter, qopt, 7);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 700000);
qopt->cycle_time = 2000000;
qopt->cycle_time_extension = 1900000;
qopt->entries[0].gate_mask = 0x96;
qopt->entries[0].interval = 400000;
qopt->entries[1].gate_mask = 0x97;
qopt->entries[1].interval = 1600000;
qopt->num_entries = 2;
delay_base_time(adapter, qopt, 9);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to different phase and shorter cycle time */
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 1500000;
qopt->cycle_time_extension = 700000;
qopt->entries[0].gate_mask = 0x98;
qopt->entries[0].interval = 400000;
qopt->entries[1].gate_mask = 0x99;
qopt->entries[1].interval = 600000;
qopt->entries[2].gate_mask = 0x9A;
qopt->entries[2].interval = 500000;
qopt->num_entries = 3;
delay_base_time(adapter, qopt, 3);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 100000);
qopt->cycle_time = 500000;
qopt->cycle_time_extension = 300000;
qopt->entries[0].gate_mask = 0x9B;
qopt->entries[0].interval = 150000;
qopt->entries[1].gate_mask = 0x9C;
qopt->entries[1].interval = 350000;
qopt->num_entries = 2;
delay_base_time(adapter, qopt, 9);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
/* change to different cycle time */
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 1000000;
qopt->cycle_time_extension = 700000;
qopt->entries[0].gate_mask = 0xAD;
qopt->entries[0].interval = 400000;
qopt->entries[1].gate_mask = 0xAE;
qopt->entries[1].interval = 300000;
qopt->entries[2].gate_mask = 0xAF;
qopt->entries[2].interval = 300000;
qopt->num_entries = 3;
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 400000;
qopt->cycle_time_extension = 100000;
qopt->entries[0].gate_mask = 0xA0;
qopt->entries[0].interval = 200000;
qopt->entries[1].gate_mask = 0xA1;
qopt->entries[1].interval = 200000;
qopt->num_entries = 2;
delay_base_time(adapter, qopt, 19);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 500000;
qopt->cycle_time_extension = 499999;
qopt->entries[0].gate_mask = 0xB2;
qopt->entries[0].interval = 100000;
qopt->entries[1].gate_mask = 0xB3;
qopt->entries[1].interval = 100000;
qopt->entries[2].gate_mask = 0xB4;
qopt->entries[2].interval = 100000;
qopt->entries[3].gate_mask = 0xB5;
qopt->entries[3].interval = 200000;
qopt->num_entries = 4;
delay_base_time(adapter, qopt, 19);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
qopt->base_time = ktime_set(0, 0);
qopt->cycle_time = 6000000;
qopt->cycle_time_extension = 5999999;
qopt->entries[0].gate_mask = 0xC6;
qopt->entries[0].interval = 1000000;
qopt->entries[1].gate_mask = 0xC7;
qopt->entries[1].interval = 1000000;
qopt->entries[2].gate_mask = 0xC8;
qopt->entries[2].interval = 1000000;
qopt->entries[3].gate_mask = 0xC9;
qopt->entries[3].interval = 1500000;
qopt->entries[4].gate_mask = 0xCA;
qopt->entries[4].interval = 1500000;
qopt->num_entries = 5;
delay_base_time(adapter, qopt, 1);
if (!enable_check_taprio(adapter, qopt, 100))
goto failed;
if (!disable_taprio(adapter))
goto failed;
kfree(qopt);
return true;
failed:
disable_taprio(adapter);
kfree(qopt);
return false;
}
int tsnep_ethtool_get_test_count(void)
{
return TSNEP_TEST_COUNT;
}
void tsnep_ethtool_get_test_strings(u8 *data)
{
memcpy(data, tsnep_test_strings, sizeof(tsnep_test_strings));
}
void tsnep_ethtool_self_test(struct net_device *netdev,
struct ethtool_test *eth_test, u64 *data)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
eth_test->len = TSNEP_TEST_COUNT;
if (eth_test->flags != ETH_TEST_FL_OFFLINE) {
/* no tests are done online */
data[TSNEP_TEST_ENABLE] = 0;
data[TSNEP_TEST_TAPRIO] = 0;
data[TSNEP_TEST_TAPRIO_CHANGE] = 0;
data[TSNEP_TEST_TAPRIO_EXTENSION] = 0;
return;
}
if (tsnep_test_gc_enable(adapter)) {
data[TSNEP_TEST_ENABLE] = 0;
} else {
eth_test->flags |= ETH_TEST_FL_FAILED;
data[TSNEP_TEST_ENABLE] = 1;
}
if (tsnep_test_taprio(adapter)) {
data[TSNEP_TEST_TAPRIO] = 0;
} else {
eth_test->flags |= ETH_TEST_FL_FAILED;
data[TSNEP_TEST_TAPRIO] = 1;
}
if (tsnep_test_taprio_change(adapter)) {
data[TSNEP_TEST_TAPRIO_CHANGE] = 0;
} else {
eth_test->flags |= ETH_TEST_FL_FAILED;
data[TSNEP_TEST_TAPRIO_CHANGE] = 1;
}
if (tsnep_test_taprio_extension(adapter)) {
data[TSNEP_TEST_TAPRIO_EXTENSION] = 0;
} else {
eth_test->flags |= ETH_TEST_FL_FAILED;
data[TSNEP_TEST_TAPRIO_EXTENSION] = 1;
}
}

443
drivers/net/ethernet/engleder/tsnep_tc.c Normal file
View file

@ -0,0 +1,443 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */
#include "tsnep.h"
#include <net/pkt_sched.h>
/* save one operation at the end for additional operation at list change */
#define TSNEP_MAX_GCL_NUM (TSNEP_GCL_COUNT - 1)
static int tsnep_validate_gcl(struct tc_taprio_qopt_offload *qopt)
{
int i;
u64 cycle_time;
if (!qopt->cycle_time)
return -ERANGE;
if (qopt->num_entries > TSNEP_MAX_GCL_NUM)
return -EINVAL;
cycle_time = 0;
for (i = 0; i < qopt->num_entries; i++) {
if (qopt->entries[i].command != TC_TAPRIO_CMD_SET_GATES)
return -EINVAL;
if (qopt->entries[i].gate_mask & ~TSNEP_GCL_MASK)
return -EINVAL;
if (qopt->entries[i].interval < TSNEP_GCL_MIN_INTERVAL)
return -EINVAL;
cycle_time += qopt->entries[i].interval;
}
if (qopt->cycle_time != cycle_time)
return -EINVAL;
if (qopt->cycle_time_extension >= qopt->cycle_time)
return -EINVAL;
return 0;
}
static void tsnep_write_gcl_operation(struct tsnep_gcl *gcl, int index,
u32 properties, u32 interval, bool flush)
{
void __iomem *addr = gcl->addr +
sizeof(struct tsnep_gcl_operation) * index;
gcl->operation[index].properties = properties;
gcl->operation[index].interval = interval;
iowrite32(properties, addr);
iowrite32(interval, addr + sizeof(u32));
if (flush) {
/* flush write with read access */
ioread32(addr);
}
}
static u64 tsnep_change_duration(struct tsnep_gcl *gcl, int index)
{
u64 duration;
int count;
/* change needs to be triggered one or two operations before start of
* new gate control list
* - change is triggered at start of operation (minimum one operation)
* - operation with adjusted interval is inserted on demand to exactly
* meet the start of the new gate control list (optional)
*
* additionally properties are read directly after start of previous
* operation
*
* therefore, three operations needs to be considered for the limit
*/
duration = 0;
count = 3;
while (count) {
duration += gcl->operation[index].interval;
index--;
if (index < 0)
index = gcl->count - 1;
count--;
}
return duration;
}
static void tsnep_write_gcl(struct tsnep_gcl *gcl,
struct tc_taprio_qopt_offload *qopt)
{
int i;
u32 properties;
u64 extend;
u64 cut;
gcl->base_time = ktime_to_ns(qopt->base_time);
gcl->cycle_time = qopt->cycle_time;
gcl->cycle_time_extension = qopt->cycle_time_extension;
for (i = 0; i < qopt->num_entries; i++) {
properties = qopt->entries[i].gate_mask;
if (i == (qopt->num_entries - 1))
properties |= TSNEP_GCL_LAST;
tsnep_write_gcl_operation(gcl, i, properties,
qopt->entries[i].interval, true);
}
gcl->count = qopt->num_entries;
/* calculate change limit; i.e., the time needed between enable and
* start of new gate control list
*/
/* case 1: extend cycle time for change
* - change duration of last operation
* - cycle time extension
*/
extend = tsnep_change_duration(gcl, gcl->count - 1);
extend += gcl->cycle_time_extension;
/* case 2: cut cycle time for change
* - maximum change duration
*/
cut = 0;
for (i = 0; i < gcl->count; i++)
cut = max(cut, tsnep_change_duration(gcl, i));
/* use maximum, because the actual case (extend or cut) can be
* determined only after limit is known (chicken-and-egg problem)
*/
gcl->change_limit = max(extend, cut);
}
static u64 tsnep_gcl_start_after(struct tsnep_gcl *gcl, u64 limit)
{
u64 start = gcl->base_time;
u64 n;
if (start <= limit) {
n = div64_u64(limit - start, gcl->cycle_time);
start += (n + 1) * gcl->cycle_time;
}
return start;
}
static u64 tsnep_gcl_start_before(struct tsnep_gcl *gcl, u64 limit)
{
u64 start = gcl->base_time;
u64 n;
n = div64_u64(limit - start, gcl->cycle_time);
start += n * gcl->cycle_time;
if (start == limit)
start -= gcl->cycle_time;
return start;
}
static u64 tsnep_set_gcl_change(struct tsnep_gcl *gcl, int index, u64 change,
bool insert)
{
/* previous operation triggers change and properties are evaluated at
* start of operation
*/
if (index == 0)
index = gcl->count - 1;
else
index = index - 1;
change -= gcl->operation[index].interval;
/* optionally change to new list with additional operation in between */
if (insert) {
void __iomem *addr = gcl->addr +
sizeof(struct tsnep_gcl_operation) * index;
gcl->operation[index].properties |= TSNEP_GCL_INSERT;
iowrite32(gcl->operation[index].properties, addr);
}
return change;
}
static void tsnep_clean_gcl(struct tsnep_gcl *gcl)
{
int i;
u32 mask = TSNEP_GCL_LAST | TSNEP_GCL_MASK;
void __iomem *addr;
/* search for insert operation and reset properties */
for (i = 0; i < gcl->count; i++) {
if (gcl->operation[i].properties & ~mask) {
addr = gcl->addr +
sizeof(struct tsnep_gcl_operation) * i;
gcl->operation[i].properties &= mask;
iowrite32(gcl->operation[i].properties, addr);
break;
}
}
}
static u64 tsnep_insert_gcl_operation(struct tsnep_gcl *gcl, int ref,
u64 change, u32 interval)
{
u32 properties;
properties = gcl->operation[ref].properties & TSNEP_GCL_MASK;
/* change to new list directly after inserted operation */
properties |= TSNEP_GCL_CHANGE;
/* last operation of list is reserved to insert operation */
tsnep_write_gcl_operation(gcl, TSNEP_GCL_COUNT - 1, properties,
interval, false);
return tsnep_set_gcl_change(gcl, ref, change, true);
}
static u64 tsnep_extend_gcl(struct tsnep_gcl *gcl, u64 start, u32 extension)
{
int ref = gcl->count - 1;
u32 interval = gcl->operation[ref].interval + extension;
start -= gcl->operation[ref].interval;
return tsnep_insert_gcl_operation(gcl, ref, start, interval);
}
static u64 tsnep_cut_gcl(struct tsnep_gcl *gcl, u64 start, u64 cycle_time)
{
u64 sum = 0;
int i;
/* find operation which shall be cutted */
for (i = 0; i < gcl->count; i++) {
u64 sum_tmp = sum + gcl->operation[i].interval;
u64 interval;
/* sum up operations as long as cycle time is not exceeded */
if (sum_tmp > cycle_time)
break;
/* remaining interval must be big enough for hardware */
interval = cycle_time - sum_tmp;
if (interval > 0 && interval < TSNEP_GCL_MIN_INTERVAL)
break;
sum = sum_tmp;
}
if (sum == cycle_time) {
/* no need to cut operation itself or whole cycle
* => change exactly at operation
*/
return tsnep_set_gcl_change(gcl, i, start + sum, false);
}
return tsnep_insert_gcl_operation(gcl, i, start + sum,
cycle_time - sum);
}
static int tsnep_enable_gcl(struct tsnep_adapter *adapter,
struct tsnep_gcl *gcl, struct tsnep_gcl *curr)
{
u64 system_time;
u64 timeout;
u64 limit;
/* estimate timeout limit after timeout enable, actually timeout limit
* in hardware will be earlier than estimate so we are on the safe side
*/
tsnep_get_system_time(adapter, &system_time);
timeout = system_time + TSNEP_GC_TIMEOUT;
if (curr)
limit = timeout + curr->change_limit;
else
limit = timeout;
gcl->start_time = tsnep_gcl_start_after(gcl, limit);
/* gate control time register is only 32bit => time shall be in the near
* future (no driver support for far future implemented)
*/
if ((gcl->start_time - system_time) >= U32_MAX)
return -EAGAIN;
if (curr) {
/* change gate control list */
u64 last;
u64 change;
last = tsnep_gcl_start_before(curr, gcl->start_time);
if ((last + curr->cycle_time) == gcl->start_time)
change = tsnep_cut_gcl(curr, last,
gcl->start_time - last);
else if (((gcl->start_time - last) <=
curr->cycle_time_extension) ||
((gcl->start_time - last) <= TSNEP_GCL_MIN_INTERVAL))
change = tsnep_extend_gcl(curr, last,
gcl->start_time - last);
else
change = tsnep_cut_gcl(curr, last,
gcl->start_time - last);
WARN_ON(change <= timeout);
gcl->change = true;
iowrite32(change & 0xFFFFFFFF, adapter->addr + TSNEP_GC_CHANGE);
} else {
/* start gate control list */
WARN_ON(gcl->start_time <= timeout);
gcl->change = false;
iowrite32(gcl->start_time & 0xFFFFFFFF,
adapter->addr + TSNEP_GC_TIME);
}
return 0;
}
static int tsnep_taprio(struct tsnep_adapter *adapter,
struct tc_taprio_qopt_offload *qopt)
{
struct tsnep_gcl *gcl;
struct tsnep_gcl *curr;
int retval;
if (!adapter->gate_control)
return -EOPNOTSUPP;
if (!qopt->enable) {
/* disable gate control if active */
mutex_lock(&adapter->gate_control_lock);
if (adapter->gate_control_active) {
iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
adapter->gate_control_active = false;
}
mutex_unlock(&adapter->gate_control_lock);
return 0;
}
retval = tsnep_validate_gcl(qopt);
if (retval)
return retval;
mutex_lock(&adapter->gate_control_lock);
gcl = &adapter->gcl[adapter->next_gcl];
tsnep_write_gcl(gcl, qopt);
/* select current gate control list if active */
if (adapter->gate_control_active) {
if (adapter->next_gcl == 0)
curr = &adapter->gcl[1];
else
curr = &adapter->gcl[0];
} else {
curr = NULL;
}
for (;;) {
/* start timeout which discards late enable, this helps ensuring
* that start/change time are in the future at enable
*/
iowrite8(TSNEP_GC_ENABLE_TIMEOUT, adapter->addr + TSNEP_GC);
retval = tsnep_enable_gcl(adapter, gcl, curr);
if (retval) {
mutex_unlock(&adapter->gate_control_lock);
return retval;
}
/* enable gate control list */
if (adapter->next_gcl == 0)
iowrite8(TSNEP_GC_ENABLE_A, adapter->addr + TSNEP_GC);
else
iowrite8(TSNEP_GC_ENABLE_B, adapter->addr + TSNEP_GC);
/* done if timeout did not happen */
if (!(ioread32(adapter->addr + TSNEP_GC) &
TSNEP_GC_TIMEOUT_SIGNAL))
break;
/* timeout is acknowledged with any enable */
iowrite8(TSNEP_GC_ENABLE_A, adapter->addr + TSNEP_GC);
if (curr)
tsnep_clean_gcl(curr);
/* retry because of timeout */
}
adapter->gate_control_active = true;
if (adapter->next_gcl == 0)
adapter->next_gcl = 1;
else
adapter->next_gcl = 0;
mutex_unlock(&adapter->gate_control_lock);
return 0;
}
int tsnep_tc_setup(struct net_device *netdev, enum tc_setup_type type,
void *type_data)
{
struct tsnep_adapter *adapter = netdev_priv(netdev);
switch (type) {
case TC_SETUP_QDISC_TAPRIO:
return tsnep_taprio(adapter, type_data);
default:
return -EOPNOTSUPP;
}
}
int tsnep_tc_init(struct tsnep_adapter *adapter)
{
if (!adapter->gate_control)
return 0;
/* open all gates */
iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
iowrite32(TSNEP_GC_OPEN | TSNEP_GC_NEXT_OPEN, adapter->addr + TSNEP_GC);
adapter->gcl[0].addr = adapter->addr + TSNEP_GCL_A;
adapter->gcl[1].addr = adapter->addr + TSNEP_GCL_B;
return 0;
}
void tsnep_tc_cleanup(struct tsnep_adapter *adapter)
{
if (!adapter->gate_control)
return;
if (adapter->gate_control_active) {
iowrite8(TSNEP_GC_DISABLE, adapter->addr + TSNEP_GC);
adapter->gate_control_active = false;
}
}